Thaumastopeus agni is a species of beetle described by Wallace in 1867. No subspecies are listed.
References Wallace A.R. (1867) A Catalogue of the Cetoniinae of the Malayan Archipelage, with descriptions of the new species, brief diagnose of novelties, Proceedings of the Entomological Society. London 3:92-97 (xcii-xcvii) Scarabs: World Scarabaeidae Database. Schoolmeesters P., 2011-05-30